iOS 7 Beta 1 is a visual disaster full of readability and usability problems. Lets all hope over the new few months those issues are resolved. Regardless though, I think Apple went to far away from what has worked for them for 6 versions.
Some loud voices were screaming about the use of green felt and exaggerated textures; but what iOS 7 looks like now is a complete 180. It's like Apple said, "Oh yeah? You don't like textures and visual depth? Fine! Take this!"
The icons are the worst offenders of this new visual style. Icons have been striped of all character and depth. They are all one dimension and rely on harsh gradients and odd color combinations to differentiate themselves.
I patiently wait for the Fall. I've owned every iPhone, always updated to the newest OS on Day 1, but I may just stay on iOS 6 if the design isn't finished. Because, what we see now cant be the finished product.